Make life and workouts so much smoother with the sports-oriented casio g-shock g-steel g-squad watch. This style features a streamlined design, heart rate monitor and shock-resistant construction. Iconic 44mm bio-based resin and gold-tone stainless steel case and bezel black dial with reverse lcd mineral crystal pair to smartphone via bluetooth® and tap into the polar™ smartwatch library functions include optical heart rate sensor, accelerometer, world time, stopwatch, countdown timer and alarm solar-powered digital movement black bio-based resin band; buckle clasp water-resistant to 200 meters